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Finding the Fourth Proportional to 687.68, 949.92 and 655.28

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Solution

The fourth proportional to 687.68, 949.92 and 655.28 is: 905.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.68 : 949.92 = 655.28 : x
  2. Step 2: Convert to fraction form
    687.68/949.92 = 655.28/x
  3. Step 3: Cross multiply
    687.68x = 949.92 × 655.28
  4. Step 4: Simplify right side
    687.68x = 622,463.58
  5. Step 5: Solve for x
    x = 622,463.58/687.68
  6. Step 6: Final answer
    x = 905.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.